Speed Converters
60 mph equals 96.56 km/h, and one knot is exactly 1.852 km/h — the nautical mile per hour used in aviation and shipping worldwide. Those two facts alone cover most of what drivers, pilots, and sailors need daily. Every converter here applies the exact definition, not a rounded approximation, so mph to km/h always comes back to four decimal places of precision.
The speed of sound at sea level is about 343 m/s, which is Mach 1 — the reference point for supersonic flight. From there the scale stretches in both directions: a brisk walk is roughly 1.4 m/s, a commercial jet cruises near Mach 0.85, and a rifle bullet travels close to Mach 3. The 22 converters here span that entire range, linking everyday road speeds to nautical knots, feet per second, meters per second, and the Mach numbers that describe flight. Need to know how fast a knot is relative to the speed of sound? Try knot to speed of sound.
Metric speed is straightforward — km/h to m/s is just divide by 3.6. Imperial and nautical units are trickier because they don't share a clean ratio: a knot is not a round fraction of mph, and feet per second sits at an awkward 0.3048 m/s. That's where converters earn their keep. Start with the popular pairs below, or scroll for the full list including mph to speed of sound and beyond.
Most popular
Kilometers per Hour to Knots
1 knot = 1.852 km/h. Convert km/h to knots and back with real maritime, aviation, and wind speeds.
MPH to KM/H Converter
Convert miles per hour to kilometers per hour and km/h to mph.
Miles per Hour to Speed of Sound
Convert miles per hour to speed of sound and back.
Knots to Speed of Sound
Convert knots to speed of sound and back.
Speed of Sound to Mach
Convert speed of sound to mach and back.
Mach to Kilometers per Second
Convert mach to kilometers per second and back.
FT/S to M/S Converter
Convert feet per second to meters per second and m/s to ft/s.
All speed converters
MPH to KM/H Converter
Convert miles per hour to kilometers per hour and km/h to mph.
M/S to KM/H Converter
Convert meters per second to kilometers per hour and km/h to m/s.
FT/S to M/S Converter
Convert feet per second to meters per second and m/s to ft/s.
KM/H to MPH Converter
Convert kilometers per hour to miles per hour and mph to km/h.
MPH to M/S Converter
Convert miles per hour to meters per second and m/s to mph.
Kilometers per Hour to Knots
1 knot = 1.852 km/h. Convert km/h to knots and back with real maritime, aviation, and wind speeds.
Knots to Miles per Hour
Convert knots to miles per hour and back.
Miles per Hour to Mach
Convert miles per hour to mach and back.
Kilometers per Second to Mach
Convert kilometers per second to mach and back.
Kilometers per Second to Meters per Second
Convert kilometers per second to meters per second and back.
Kilometers per Second to Speed of Sound
Convert kilometers per second to speed of sound and back.
Knots to Mach
Convert knots to mach and back.
Knots to Speed of Sound
Convert knots to speed of sound and back.
Mach to Kilometers per Second
Convert mach to kilometers per second and back.
Miles per Hour to Speed of Sound
Convert miles per hour to speed of sound and back.
Meters per Second to Speed of Sound
Convert meters per second to speed of sound and back.
Speed of Light to Knots
Convert speed of light to knots and back.
Speed of Sound to Kilometers per Hour
Convert speed of sound to kilometers per hour and back.
Speed of Sound to Knots
Convert speed of sound to knots and back.
Speed of Sound to Mach
Convert speed of sound to mach and back.
Speed of Sound to Miles per Hour
Convert speed of sound to miles per hour and back.
Speed of Sound to Speed of Light
Convert speed of sound to speed of light and back.